CVE-2019-18187 Trend Micro OfficeScan Directory Traversal

Exploited in the wild High 8.8 Published 28 Oct 2019 Updated 29 Oct 2025

Authenticated attackers can exploit a directory traversal flaw in Trend Micro OfficeScan to extract files from zip archives, potentially leading to remote code execution.

Exploited in the wild: Since 3 Nov 2021
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2019-18187?

CVE-2019-18187 is a high-severity path traversal vulnerability in Trendmicro Officescan, published on 28 Oct 2019. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Trend Micro OfficeScan versions 11.0 and XG (12.0) could be exploited by an attacker utilizing a directory traversal vulnerability to extract files from an arbitrary zip file to a specific folder on the OfficeScan server, which could potentially lead to remote code execution (RCE). The remote process execution is bound to a web service account, which depending on the web platform used may have restricted permissions. An attempted attack requires user authentication.

Weakness: CWE-22

Which versions are affected by CVE-2019-18187?

It affects 1 product.

Products include Trendmicro Officescan.

How do I fix CVE-2019-18187?

No fix has been published for CVE-2019-18187 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 3 May 2022.

Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.

Is CVE-2019-18187 being exploited?

Yes. Attackers have exploited CVE-2019-18187 in the wild since at least 3 Nov 2021.

All Trendmicro Officescan vulnerabilities

Sources

Also known as GHSA-cjq6-9jh6-x2vg.